If you are having problem resetting it its best to open the 2 screws under the sticker at the bottom of the device and open it. Then you will need to select reset belkin router instead of factory restore.

5 Ways To Fix Belkin Router Slow Internet Internet Access Guide
Belkin router wont reset. With the reset button still held down turn the power back on and hold for another 30 seconds. How to hack wifi password using new wpawpa2 flaw. To reset the router youll need to press this button while the router is connected to power and hold it down for about 10 seconds. While the router is powered on press and hold the reset button for 15 seconds. There are two ways to factory reset a belkin router a software reset and a hard reset. After you release the button the router will reset itself to the factory default settings and then reboot.
On some routers the options are router maintenance and settings. The instruction manual for the belkin says a momentary push on the reset will do a quick reset. While 20 seconds will perform a full hard reset. After this 90 second process is complete your router is restored to its factory default state. Log into your router as an administrator through 19216821. Navigate to administration select advanced settings and select restore factory defaults.
Your belkin router has now been reset to its factory default settings. With the router powered on press and hold the reset button for exactly seven seconds this will restore the router to factory default. Wait for at least one minute for the router to restart. By default the password on the router is left blank. Then very carefully without touching any electronic parts inside with your fingers use something to push the reset switch for few seconds. Soft factory reset a belkin router.
The reset switch in belkin f5d7230 is not very easy to push. To solve this i decided to reset the router. In case if you still get any problem accessing your belkin router than we recommend you to reset your belkin router to default factory settings. Using 19216821 as a default gateway. While still holding down the button unplug the router from its power source for another 30 seconds. Power it up with the reset shorted for a while or in a sequence like this hold reset button while powered on for 5 secs while holding reset button unplug power for 5 secs replug power continue to hold reset for 5 secs.
As a last option. So this was all about on how to login into belkin router.